Internal Tides On The Australian North West Shelf
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Internal Tides On The Australian North West Shelf
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Author : Peter Eric Holloway
language : en
Publisher:
Release Date : 1983
Internal Tides On The Australian North West Shelf written by Peter Eric Holloway and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with North West Shelf (W.A.) categories.
Internal Wave Dynamics On The Australian North West Shelf
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Author : Paul Van Gastel
language : en
Publisher:
Release Date : 2010
Internal Wave Dynamics On The Australian North West Shelf written by Paul Van Gastel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Baroclinicity categories.
[Truncated abstract] Internal waves are a frequently encountered phenomenon throughout the global ocean. They are generated by disturbances to a stratified ocean at frequencies between the inertial and buoyancy frequency. On continental shelf and slope regions, a common generation source is the oscillating barotropic tidal flow over varying topography, which gives rise to the internal tide. Under certain conditions, the internal tide can transform into a set of high-frequency, nonlinear internal waves. In the deep ocean, internal tides are generated at mid-oceanic topographic features. The mechanism of generation of internal waves on the shelf break and at mid-oceanic topographic features is essentially the same. The weak stratification in the deep ocean means that little energy is required here to cause significant mixing (Munk and Wunsch, 2007). Internal tides generated on the shelf break and in the deep ocean are assumed to play a very important role in dissipating tidal energy (Garrett and Kunze, 2007). Assimilation of altimeter data of tides into numerical models (Egbert & Ray 2001) showed that tides lose much more energy in the open ocean compared to coastal waters. This can be ascribed to bottom friction, generally in deep-sea regions with significant topographic features. Internal waves are studied for a variety of reasons. They provide a mechanism for the removal of energy from the barotropic tide, via the internal tide, into high-frequency internal waves, eventually to be dissipated into turbulent motions when the waves break (e.g. Kantha and Tierney, 1997). The strong horizontal currents and vertical shear associated with internal waves may destabilize underwater platforms and drilling operations for oil exploration (Bole et al, 1994). Internal waves may also cause lateral transport of nutrients (Scotti and Pineda, 2004) and the perturbations in the density field due to internal wave motions can cause large fluctuations in the sound speed and thus affect acoustic propagation which is of particular relevance to the design of sonar systems (Duda and Preisig, 1999). Observations of internal waves from field measurements and satellite imagery show the phenomenon to be highly variable in space and time and sensitive to environmental conditions with small changes producing significant changes to the internal wave strength and form. This is particularly true of the Australian North West Shelf where internal waves are known to be both ubiquitous and very energetic. This study investigates, using a comprehensive set of field observations and numerical modeling using the 3-dimensional hydrostatic ROMS model, the long-term temporal and spatial variability of the internal wave climatology on the southern region of the Australian North West Shelf (NWS)...
Shocks In The Internal Tide On The Australian North West Shelf
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Author : Adrian Hall Pincombe
language : en
Publisher:
Release Date : 1988
Shocks In The Internal Tide On The Australian North West Shelf written by Adrian Hall Pincombe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Tides categories.
Oceanic Internal Tides Observations Analysis And Modeling
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Author : Eugene G. Morozov
language : en
Publisher: Springer
Release Date : 2018-02-08
Oceanic Internal Tides Observations Analysis And Modeling written by Eugene G. Morozov and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-02-08 with Science categories.
This book presents a detailed study of the structure and variability of internal tides and their geographical distribution in the ocean. Based on experimental analysis of oceanic measurements combined with numerical modeling, it offers a comprehensive overview of the internal wave processes around the globe. In particular, it is based on moored buoys observations in many regions in all oceans (Atlantic, Pacific, Indian, Arctic, and Southern) that have been carried out by researchers from different countries for more than 40 years as part of various oceanographic programs, including WOCE and CLIVAR. However, a significant portion of the data was collected by the author, who is a field oceanographer. The data was processed and interpreted on the basis of the latest knowledge of internal wave motion. The properties of internal waves were analyzed in relation to the bottom topography and mean state of the ocean in specific regions. Internal waves play a major role in the formation of seawater stratification and are responsible for the main processes of ocean dynamics, such as energy transfer and mixing. One of the most significant ideas presented in this book is the generation of internal tides over submarine ridges. Energy fluxes from submarine ridges related to tidal internal waves greatly exceed the fluxes from continental slopes. Submarine ridges form an obstacle to the propagation of tidal currents, which can cause the creation of large amplitude internal tides. Energy fluxes from submarine ridges account for approximately one fourth of the total energy dissipation of the barotropic tides. Model simulations and moored measurements have been combined to generate a map of global distribution of internal tide amplitudes. This book is of interest to oceanographers, marine biologists, civil engineers, and scientists working in climate research, fluid mechanics, acoustics, and underwater navigation.
Observations And Modeling Of The Internal Tide In A Submarine Canyon
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Author : Emil T. Petruncio
language : en
Publisher:
Release Date : 1996
Observations And Modeling Of The Internal Tide In A Submarine Canyon written by Emil T. Petruncio and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Science categories.
Shipboard ADCP and CTD measurements were conducted in Monterey Submarine Canyon in April and October 1994 to determine the propagation characteristics and energy levels of the semidiurnal internal tide. The measurements reveal a bottom intensified internal tide propagating energy up canyon. The region of strongest motion is in a beam 150-200 m thick, centered approximately 150 m above the Canyon floor. Along canyon baroclinic M2 currents are typically 15-20 cm/s, an order of magnitude larger than the estimated barotropic tidal currents. In April 1994, the internal tidal beam is well described by a progressive wave, while in October 1994, the signal is standing along and perpendicular to the beam. The Princeton Ocean Model was used to study the generation and propagation of semidiurnal internal tides in submarine canyons and to investigate their sensitivity to canyon shape.
Tidal Hydrodynamics
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Author : Bruce B. Parker
language : en
Publisher: John Wiley & Sons
Release Date : 1991-09-03
Tidal Hydrodynamics written by Bruce B. Parker and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-09-03 with Science categories.
Consists of refereed papers by the world's leading authorities on tidal hydrodynamics. Its forty-four papers, including nine review papers, cover all aspects of the subject and present, for the first time in one place, state of the art treatments of recent advances including tidal detection from satellite altimetry, global tide modeling, nonlinear tidal interactions and internal tidal phenomena.
Baroclinic Tides
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Author : Vasiliy Vlasenko
language : en
Publisher: Cambridge University Press
Release Date : 2005-07-14
Baroclinic Tides written by Vasiliy Vlasenko and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-07-14 with Science categories.
This book was first published in 2005. When an oceanic tidal wave that is primarily active on the water surface passes an ocean shelf or a region with a seamount, it is split into a less energetic surface wave and other internal modes with different wavelengths and propagation speeds. This cascading process, from the barotropic tides to the baroclinic components, leads to the transformation of tidal energy into turbulence and heat, an important process for the dynamics of the lower ocean. Baroclinic Tides demonstrates the analytical and numerical methods used to study the generation and evolution of baroclinic tides and, by comparison with experiments and observational data, shows how to distinguish and interpret internal waves. Strongly non-linear solitary internal waves, which are generated by internal tidal waves at the final stage of their evolution, are investigated in detail. This book is intended for researchers and graduate students of physical oceanography, geophysical fluid dynamics and hydroacoustics.
Internal Gravity Waves In The Shallow Seas
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Author : Stanisław R. Massel
language : en
Publisher: Springer
Release Date : 2015-07-07
Internal Gravity Waves In The Shallow Seas written by Stanisław R. Massel and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-07-07 with Science categories.
This book contains a comprehensive study of the internal ocean waves, which play a very important role in ocean physics providing mechanisms for ocean water mixing and circulation, as well as the transportation of gases, nutrients, and a very large number of marine organisms in the ocean body. In contrast to surface waves, the literature on internal waves is not so numerous, mainly due to the difficulties in experimental data collection and in the mathematical description of internal wave propagation. In this book, the basic mathematical principles, a physical description of the observed phenomena, and practical theoretical methods of determination of wave parameters as well as the original method of observation using moving sensors are presented. Special attention is paid to internal wave propagation over changing bottom topographies in shallow seas such as the Baltic Sea. The book is supplemented with an extended list of relevant and extended bibliographies, a subject index, and an author index.
The Global Coastal Ocean Regional Studies And Syntheses
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Author : Kenneth H. Brink
language : en
Publisher: Harvard University Press
Release Date : 2005
The Global Coastal Ocean Regional Studies And Syntheses written by Kenneth H. Brink and has been published by Harvard University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Political Science categories.
The Generation Of Internal Waves Over Continental Shelf Topography
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Author : Kenny Kay Wooi Lim
language : en
Publisher:
Release Date : 2010
The Generation Of Internal Waves Over Continental Shelf Topography written by Kenny Kay Wooi Lim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Continental slopes categories.
Laboratory experiments were performed to examine the generation of internal waves by barotropic tidal flow over a continental slope, in both a two-layer and a continuously stratified fluid, under varying tidal forcing intensity and density stratification. Observations for the two-layer case revealed the formation of both linear and nonlinear waveforms as the barotropic tide interacted with the continental slope. The type of wave response generated was strongly dependent on the tidal forcing intensity and the position of the density interface relative to the shelf depth. In general, for a given tidal forcing as the layer depth ratio, the ratio of the upper layer depth to the total water depth over the shelf, approached unity (i.e., the point when the density interface intersected the bottom slope), nonlinear effects increased and the generated waveform transitioned from a linear wave of depression to an internal surge and finally to an internal bolus feature. Like the two-layer case, a range of wave responses was also observed in the continuous stratification experiments, ranging from internal wave beams to internal boluses and finally no wave-like response at all. Here, the type of response generated was primarily dependent on both the Reynolds number and the topographic steepness parameter. To simplify this two-parameter problem, a generation parameter G was defined, where G is the ratio of the Reynolds number to the topographic steepness parameter. This generation parameter G was shown to be a simple and efficient way of classifying the different types of flow responses over the entire parameter range. For each density stratification case and using these dimensionless parameters, a flow regime diagram of the observed responses was developed showing the conditions under which a particular type of response was expected to dominate. These observations compared well to field observations of internal waves on the Australian North West Shelf, the region motivating this work. A tidal energy budget analysis indicated that up to 15% of the barotropic energy could be converted into internal tides; two-thirds of this energy was dissipated close to the generation region, and the other one-third radiated away into the stratified interior.